The most common way to play it over the Internet is with IPRemote.
Google Earth has a flight simulator that allows you to fly around the virtual globe view it
Get a solid prediction on whether or not you'll arrive on time with Flightcaster view it
The Bing iPhone application makes it easy to find deals on flights from your local airport or check the status on a specific flight. view it
Building your own package deal to save time and money when traveling view it
Getting the flight you want at the price you want to pay view it
See where a plane is in the sky with Flightview view it
AirfareWatchdog makes it easy to save big on last-minute travel view it
